APA-referens (7:e uppl.)

Ludendorff, M. (1954). The origin and nature of the soul. Hohe Warte.

Chicago-referens (17:e uppl.)

Ludendorff, Mathilde. The Origin and Nature of the Soul. Pähl: Hohe Warte, 1954.

MLA-referens (9:e uppl.)

Ludendorff, Mathilde. The Origin and Nature of the Soul. Hohe Warte, 1954.